HDU 1260

题意:给出一些人买票的时间,可以一个人买,也可以相邻两人一起买,求所有人买完票的最短时间。

思路:一维DP,dp[i]表示第i个人买票所需要的时间,这个人可以和前一个人一起买,也可以自己买。

状态转移方程:dp[i]=min(dp[i-1]+t1[i],dp[i-2]+t2[i-1]),然后再注意初始化和对时间的处理就行了。

AC代码:

#include <iostream>
#include <cstring>
#include <cstdio>
#include <algorithm>
using namespace std;
#define inf 0x7ffffff
int main()
{
	int n,t1[2010],t2[2010],dp[2010];
	int t;
	scanf("%d",&t);
	while(t--)
	{
	   scanf("%d",&n);
	   for(int i=1;i<=n;i++)
	   dp[i]=inf;
	   for(int i=1;i<=n;i++)
	   scanf("%d",&t1[i]);
       for(int i=1;i<=n-1;i++)
	   scanf("%d",&t2[i]);
	   dp[1]=t1[1];
	   for(int i=2;i<=n;i++)
	  {
        dp[i]=min(dp[i-1]+t1[i],dp[i-2]+t2[i-1]);
	  }
	  // printf("%d\n",dp[n]);
	  int h=dp[n]/3600;
	  int m=dp[n]%3600/60;
	  int s=dp[n]%60;
	  printf("%02d:%02d:%02d ",(h+8)%24,m,s);
	  if((h+8)%24>12)
	  printf("pm\n");
	  else
	  printf("am\n");
	}
	return 0;
}



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时间: 2024-07-28 22:12:37

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